<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>3-10-4</title>
<style type="text/css">
.test{
 font-weight:bold;
 color : red;
}
.add{
 font-style:italic;
}
</style>
 <!--   引入jQuery -->
 <script src="../../scripts/jquery-1.3.1.js" type="text/javascript"></script>
 <script type="text/javascript">
 //<![CDATA[
  $(function(){
      //设置单选下拉框选中
      $("input:eq(0)").click(function(){
		    $("#single option").removeAttr("selected");  //移除属性selected
			$("#single option:eq(1)").attr("selected",true); //设置属性selected
	  });
      //设置多选下拉框选中
	  $("input:eq(1)").click(function(){
		    $("#multiple option").removeAttr("selected");  //移除属性selected
			$("#multiple option:eq(2)").attr("selected",true);//设置属性selected
			$("#multiple option:eq(3)").attr("selected",true);//设置属性selected
	  });
      //设置单选框和多选框选中
	  $("input:eq(2)").click(function(){
			$(":checkbox").removeAttr("checked"); //移除属性checked
			$(":radio").removeAttr("checked"); //移除属性checked
			$("[value=check2]:checkbox").attr("checked",true);//设置属性checked
			$("[value=check3]:checkbox").attr("checked",true);//设置属性checked
			$("[value=radio2]:radio").attr("checked",true);//设置属性checked
	  });   
  });
  //]]>
  </script>
</head>
<body>
    <input type="button" value="设置单选下拉框选中"/>
	<input type="button" value="设置多选下拉框选中"/>
	<input type="button" value="设置单选框和多选框选中"/>

<br/><br/>

<select id="single">
  <option>选择1号</option>
  <option>选择2号</option>
  <option>选择3号</option>
</select>

<select id="multiple" multiple="multiple" style="height:120px;">
  <option selected="selected">选择1号</option>
  <option>选择2号</option>
  <option>选择3号</option>
  <option>选择4号</option>
  <option selected="selected">选择5号</option>
</select>

<br/><br/>


<input type="checkbox" value="check1"/> 多选1
<input type="checkbox" value="check2"/> 多选2
<input type="checkbox" value="check3"/> 多选3
<input type="checkbox" value="check4"/> 多选4

<br/>

<input type="radio" value="radio1" name="a"/> 单选1
<input type="radio" value="radio2" name="a"/> 单选2
<input type="radio" value="radio3" name="a"/> 单选3
</body>
</html>

 